var prevTab = new Array();

   function chooseTab(tab) { // switch between tabs
      var box=tab.className;
      if (document.getElementById("text_"+prevTab[box]).className=="moreshown") {
         var newTab=tab.id;
         // change tab
         document.getElementById(prevTab[box]).src=imagePathURL+"tab_"+prevTab[box]+"_off.gif";
         document.getElementById(newTab).src=imagePathURL+"tab_"+newTab+"_on.gif";

         // change text
         document.getElementById("text_"+prevTab[box]).className="morehidden"; 
         document.getElementById("text_"+newTab).className="moreshown"; 

         prevTab[box]=newTab;
      }
   }

   function initTab(box, tab) { // choose initial tab
      prevTab[box]=tab;
      document.getElementById(tab).src=imagePathURL+"tab_"+tab+"_on.gif";
      document.getElementById("text_"+tab).className="moreshown"; 
   }